Terrain Shading Mask

Use this component to create a 3D Terrain shading mask for a particular location.
It's a diagram which maps the silhouette of the surrounding terrain (hills, valleys, mountains, tree tops...) in 360 degrees directions seen from above the astronomical horizon.
It can be used as a "context_" input in mountainous or higher latitude regions for any kind of sun related analysis: sunlight hours analysis, solar radiation analysis, view analysis, photovoltaics/solar water heating sunpath shading ...
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!!! ATTENTION !!! This component may crash Rhino 5 application due to requirement to generate large topography data! To prevent this, it is suggested to own a 64 bit version of Rhino 5 and have strong enough PC configuration. If you do not have either of these two, it is recommended to keep the maxVisibilityRadius_ value to default value of 100 to prevent the crash of Rhino.
Also try saving your .gh definition before running this component!
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Component requires that you are connected to the Internet, as it has to download the topography data.
It also requires MapWinGIS application to be installed.
Download and install either 32 bit or 64 bit (depending on your Rhino 5 version) version of MapWinGIS from here:
https://github.com/MapWindow/MapWinGIS/releases
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Component mainly based on:
"Mathematical cartography", V. Jovanovic, VGI 1983.
"Surveying and Levelling Second Edition", Tata McGraw-Hill Education Pvt. Ltd., 5.7 Corrections to be applied, N.N. Basak, 2004
"Vincenty solutions of geodesics on the ellipsoid" article by Chris Veness
https://books.google.rs/books/about/Matemati%C4%8Dka_kartografija.html?id=GcXEMgEACAAJ&redir_esc=y
https://books.google.rs/books?id=fIvvAwAAQBAJ&printsec=frontcover#v=onepage&q&f=false
http://www.movable-type.co.uk/scripts/latlong-vincenty.html
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Provided by Gismo 0.0.3